An intriguing idea of a city being buit up by the residents themselves. I like the idea and I can already hear the nay sayers – we need rules, we need control, you cannot do this. But I think it is a clever way to use all the technologies (especially twitter.com (and the open source equivalen laconi.ca) to build up a useful city information mesh. I would like to see if the this idea can be used to share taxi-rides?